A new multiphase noncatalytic process is developed for deep desulphurization of fuels or organics using hydrodynamic cavitation with vortex diode as a cavitating device. The process can ...
A process flow diagram for the HDS plant is shown in Fig. 1. Desulfurization reactions take place in fixed bed catalytic reactors (∆ R) where a minimum ratio H 2 /hydrocarbon must be ensured for catalyst maintenance reasons. Reactors are fed with a blend of fuels of different qualities. The hydrocarbon (HC) feed is mixed with the recycled H 2 stream (R) and with makeup H 2 from the network.
In the process of coal mining, prevention and control of water hazard is essential. It is the precondition for water hazard control to detect and determine the distribution of underground waterconducting channels. In urban environments, traditional methods such as active source seismic exploration and transient electromagnetic exploration commonly used in the field are difficult to carry out ...
In this work, the desulfurization process of highsulfur anthracite coal is discussed, and the desulfurization method of "reduced iron powder + heat treatment + magnetic separation" (named "RIHM") is designed. The effects of the heating temperature, heating time and coaliron mass ratio on desulfurization were discussed, the process of ...
Therefore, exhaust gas from burning process with high sulphur coal must be treated by installations for removal of SO 2. Due to the high cost of these installations and under the increasing limitations of SO 2 emissions, predesulphurization of coal is essential.
Circulating fluidized bed (CFB) boilers with wet flue gas desulfurization (WFGD) system is a popular technology for SO2 removal in the coalfired thermal power plant. However, the long response time of continues emission monitoring system (CEMS) and the hardness of continuously monitoring the coal properties leads to the difficulties for controlling WFGD. It is important to build a model that ...
![Process for coal desulfurization. [use of microwave energy]](/q4bwuz0/50.jpg)
A process for coal desulfurization generates extremely low amounts of heat from microwave energy to induce thermochemical, insitu, reactions to liberate sulfur in the form of stable gaseous species, such as H/sub 2/S, COS and SO/sub 2/. Inventors:
The wet flue gas desulphurization has been the most widely used in the coalfired power plants because of high SO 2 removal efficiency, reliability and ... Meanwhile, the desulphurization process in the PCF device was analyzed using the twofilm theory of gasliquid masstransfer. The results show that the PCF device has low pressure drop ...
environment, the desulfurization and denitration of flue gas in the combustion process of coal has become an important step. This work summarizes the desulfurization and denitration ... Desulphurization technology The existing flue gas desulfurization technologies in China include limestone gypsum wet process, ammonia process, magnesium oxide ...
Desulfurization techniques process and future challenges for commercial of crude oil products: Review ... and challenges of existing HDS processes. The second part examines recent advances in desulphurization techniques and future challenges for commercial, that are being researched around the world and are regulating the manufacture of a new ...
An anodic electrolytic oxidation desulphurization experiment was carried out on the liquefaction residue of the byproduct of a coaltoliquid enterprise in the slurry state. An electrochemical test and material characterization of raw materials before and after electrolysis showed that electrolytic oxidation can desulfurize the liquefaction ...
Flue gas desulfurization (FGD) processes have been widely used since the early 1970's for control of sulfur dioxide emissions from coalfired power plants. First generation FGD systems employ ''wet processes'' whereby the flue gas is contacted with a solution or slurry of an alkali reagent. Most of these installations use either lime or limestone.
In this study, coal fly ash was functionalized, using a simple onestep process (loading with Al3+ and sulfonation), to yield a solid acid catalyst (S/AlCFA) with strong acid sites. The catalyst was then used to produce furfural from xylose in a biphasic system (H2O(NaCl)/tetrahydrofuran). The furfural yield reached 82% at 180 °C60 min with catalyst/xylose ratio of : (w/w).
The flue gas desulfurization process in coalfired power plants is energy and resourceintensive but the ecoefficiency of this process has scarcely been considered. Given the fluctuating unit load and complex desulfurization mechanism, optimizing the desulfurization system based on the traditional mechanistic model poses a great challenge. In this regard, the present study optimized the eco ...
A novel method for the chemical desulfurization of coal in relatively moderate conditions and short times is presented. Using concentrated hydroiodic acid as a desulfurizing agent and microwaves as the energy source, sulfate and pyritic sulfur are completely removed in 10 min. Moreover, for the lowrank coals studied, variable amounts of organic sulfur, up to 70% in 20 min, can be removed, for ...
The process of bacterial coal desulfurization led to increase in calorific value showing advantage over conventional treatment methods. ... Effect of native bacteria Sinomonas flava 1C and Acidithiobacillus ferrooxidans on desulphurization of Meghalaya coal and its combustion properties. Fuel, 117 (2014), pp. 415421.
The oxidative desulphurization process of coal with different metamorphism degrees treated by an airsteam mixture has been studied. It has been shown that the pyrite present in black coal and anthracite is oxidized with the sulphur dioxide formation, and the process chemical mechanism does not depend on the quality of organic matter. ...
Solid Wastes. Nicholas P. Cheremisinoff, in Clean Electricity Through Advanced Coal Technologies, 2012 FlueGas Desulfurization Material. Fluegas desulfurization (FGD) material is a product of a process typically used for reducing SO 2 emissions from the exhaust gas system of a coalfired boiler. The physical nature of these materials varies from a wet sludge to a dry, powdered material ...
In this pretreatment process, the coal layer thickness and length of stay in the reaction cavity should be controlled, the sulphurcontaining gases within the cavity should be exported timely, and it should be ensured that the temperature of the coal sample after pretreatment was 150250 °C. ... (1996) Microwave desulphurization of coal ...
This process, termed MoltenCausticLeaching, or the Gravimelt Process, results in removal of 9099% of the coal inorganic and organic sulfur as well as 9599% of the coal mineral matter. The product coal meets all current air pollution control standards for sulfur and ash emissions, and has an increased heat content, usually in the ...
Fly ash, which is a solid waste from coal power plants, was used as a precursor to prepare a zeolitetype adsorbent. This fly ashbased zeolite (Gismondine) was active for desulfurization of a model feed of TH (500 ppm S) and BT (500 ppm S) with 43% and % sulfur removal efficiency [125]. Dolochar is a waste byproduct of the sponge iron ...
Pyrolysis desulfurization is suitable for coal. By changing the coking conditions to promote the effusion of sulfide in the form of gas. According to the pyrolysis conditions, it can be divided into pyrolysis desulfurization under atmosphere and copyrolysis desulfurization with additives [40], [41], [42]. Up to now, pyrolysis desulfurization ...
The coal hydrogen production process requires hightemperature steam as a reactant. Coalfired boilers are usually used to provide hightemperature steam. The ammoniabased desulphurization process is an effective technology to remove SO2 in the coalfired flue gas. However, the mass transfer coefficient of SO2 in such an engineered process is not readily available in the literature. In this ...
This paper briefly introduces various methods of coal desulfurization (physical desulphurization, chemical desulfurization, biological desulfurization, etc.) and analyzes some problems existing in each method. The principle and research process of friction electrostatic separation technology and high gradient magnetic separation technology in precombustion desulfurization technology are ...
The major coal desulphurization technologies prior to combustion are physical coal cleaning, chemical and biological methods. Each has some technical and economical limitations. Physical coal cleaning can only remove limited amount of inorganic sulphur due to insufficient liberation. Fine grinding can liberate fine pyrites, where novel coal ...
During research, desulphurization process has several coal parameters like ash%, VM% and FC% change. The variations of ash% through desulphurization process are shown in Figure 5. From Figure 5, it has been observed that the ash content of coal is growing with increase in contact time and KOH concentration. For 10% KOH solution, the ash% is ...
1000MW coalfired power plants using limestone gypsum wet desulphurization process are selected as the sample to analyses the relatio nship between coalfired plants' cost and benefit under the ...
The occurrence of sulfur in coal direct liquefaction residue affects its further high quality and high value utilization. Electrochemical desulfurization is characterized by mild reaction conditions, simple operation, easy separation of sulfur conversion products and little influence on the properties of the liquefied residue. An anodic electrolytic oxidation desulphurization experiment was ...
Within 30 days, it was possible to reduce the pyrite sulfur content in coal samples by 8595% and the total sulfur content by 3151%. The microorganisms were cultured on a solid nutrient medium, the process of coal desulfurization proceeded at a temperature of 30°C, the pulp density was 10%, and the coal particle size was 74 μm.
"There's a major issue around captive coal power stations in Indonesia, that runs the risk of derailing or slowing that JETP process," said Leo Roberts, an analyst at climate think tank E3G.
Technologies for desulphurisation and others cleaning process from coal have several advantages and disadvantages (Saikia et al. Citation 2016; Wilcox et al ... Singh,, A. Kumar, Singh, et al. 2018. "Bacterial Desulphurization of lowRank Coal: A Case Study of Eocene Lignite of Western Rajasthan, India." Energy Sources, Part A ...
The seawater desulfurization process includes the following three steps. (1) Absorption: the seawater contacts and absorbs the flue gas in the packed tower, and the pH of the seawater after absorption is 23. (2) Oxidation: dilute with fresh sea water and introduce aeration to oxidize sulfite.
1 INTRODUCTION. The coal is still one of the indispensable fuels in the world. In recent years, 93% of electric power is produced from coal in South Africa, 79% in China, 78% in Australia, 68% in India, and 39% in America. 1 However, a large amount of SO 2 and other sulfurcontaining gases was released into the atmosphere in the process of highsulfur coal combustion, resulting in ...
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